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331 Area Code

N Illinois

April 24, 2024
Area Code: 331
State/Region: N Illinois
Major Cities: western suburbs of Chicago
Time Zone: Central
Current Time: 2:20 PM
Date Assigned: 7/23/99
In Service Since: 10/7/07
Overlay?: Yes
Overlay Complex: 630/331
Local Call Dialing: 1+10D
Toll Call Dialing: 1+10D
   

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331 Prefixes/Exchanges

Prefix
Location / Company
Company
Assigned
331-200
BARTLETT, IL
T-MOBILE USA, INC.
7/11/11
331-201
DOWNERSGRV, IL
CELLCO PARTNERSHIP DBA VERIZON WIRELESS - IL
1/6/12
331-202
ELMHURST, IL
SPRINT SPECTRUM L.P.
1/17/12
331-203
AURORA, IL
SPRINT SPECTRUM L.P.
10/12/11
331-204
NAPERVILLE, IL
ONVOY, LLC - IL
12/10/15
331-205
AURORA, IL
T-MOBILE USA, INC.
10/21/11
331-206
AURORA, IL
SPRINT SPECTRUM L.P.
10/12/11
331-207
YORKVILLE, IL
LEVEL 3 COMMUNICATIONS, LLC - IL
11/1/11
331-208
AURORA, IL
SPRINT SPECTRUM L.P.
11/8/11
331-209
ELMHURST, IL
LEVEL 3 COMMUNICATIONS, LLC - IL
1/17/12
331-210
ST CHARLES, IL
PEERLESS NETWORK OF ILLINOIS, LLC - IL
3/6/12
331-211
[UNASSIGNED]
331-212
AURORA, IL
MCI WORLDCOM COMMUNICATIONS, INC. - IL
4/5/12
331-213
NAPERVILLE, IL
CELLCO PARTNERSHIP DBA VERIZON WIRELESS - IL
9/6/11
331-214
DOWNERSGRV, IL
CELLCO PARTNERSHIP DBA VERIZON WIRELESS - IL
6/20/12
331-215
NAPERVILLE, IL
CELLCO PARTNERSHIP DBA VERIZON WIRELESS - IL
9/28/12
331-216
OSWEGO, IL
NEW CINGULAR WIRELESS PCS, LLC - IL
10/31/12
331-217
[UNASSIGNED]
331-218
WHEATON, IL
T-MOBILE USA, INC.
7/9/13
331-219
AURORA, IL
TELNYX LLC
3/16/17
331-220
AURORA, IL
SPRINT SPECTRUM L.P.
7/12/11
331-221
ELMHURST, IL
AMERITECH ILLINOIS
1/21/09
331-222
ST CHARLES, IL
NEW CINGULAR WIRELESS PCS, LLC - IL
10/28/08
331-223
ST CHARLES, IL
NEW CINGULAR WIRELESS PCS, LLC - IL
10/28/08
331-224
[UNASSIGNED]
331-225
ELMHURST, IL
SPRINT SPECTRUM L.P.
8/22/11
331-226
NAPERVILLE, IL
T-MOBILE USA, INC.
3/20/17
331-227
SUGARGROVE, IL
CELLCO PARTNERSHIP DBA VERIZON WIRELESS - IL
5/17/16
331-228
ST CHARLES, IL
OVATION COMMUNICATIONS OF ILLINOIS, INC.
9/21/11
331-229
NAPERVILLE, IL
CELLCO PARTNERSHIP DBA VERIZON WIRELESS - IL
11/27/12
331-230
AURORA, IL
T-MOBILE USA, INC.
4/5/17
331-231
NAPERVILLE, IL
NEW CINGULAR WIRELESS PCS, LLC - IL
8/7/17
331-232
W CHICAGO, IL
NEW CINGULAR WIRELESS PCS, LLC - IL
8/8/17
331-233
DOWNERSGRV, IL
TELNYX LLC
3/13/17
331-234
SUGARGROVE, IL
CELLCO PARTNERSHIP DBA VERIZON WIRELESS - IL
7/8/13
331-235
ST CHARLES, IL
NEW CINGULAR WIRELESS PCS, LLC - IL
10/17/17
331-236
WHEATON, IL
T-MOBILE USA, INC.
4/5/17
331-237
NAPERVILLE, IL
MCI WORLDCOM COMMUNICATIONS, INC. - IL
11/7/17
331-238
DOWNERSGRV, IL
TELEPORT COMMUNICATIONS AMERICA, LLC - IL
12/19/17
331-239
YORKVILLE, IL
ONVOY, LLC
8/27/18
331-240
W CHICAGO, IL
PEERLESS NETWORK OF ILLINOIS, LLC - IL
4/10/13
331-241
LOMBARD, IL
WEST TELECOM SERVICES, LLC - IL
10/16/18
331-242
LOMBARD, IL
T-MOBILE USA, INC.
10/19/18
331-243
LOMBARD, IL
T-MOBILE USA, INC.
10/19/18
331-244
NAPERVILLE, IL
ONVOY, LLC
9/21/17
331-245
BARTLETT, IL
T-MOBILE USA, INC.
4/18/13
331-246
LEMONT, IL
T-MOBILE USA, INC.
10/19/18
331-247
NAPERVILLE, IL
VONAGE NETWORK INC.
11/21/18
331-248
GENEVA, IL
COMCAST PHONE OF ILLINOIS, LLC DBA COMCO - IL
7/6/07
331-249
NAPERVILLE, IL
ONVOY, LLC
12/5/18
331-250
AURORA, IL
T-MOBILE USA, INC.
4/10/12
331-251
DOWNERSGRV, IL
CELLCO PARTNERSHIP DBA VERIZON WIRELESS - IL
12/5/12
331-252
WARRENVL, IL
TELEPORT COMMUNICATIONS AMERICA, LLC - IL
6/2/16
331-253
LEMONT, IL
T-MOBILE USA, INC.
10/27/14
331-254
SUGARGROVE, IL
T-MOBILE USA, INC.
7/16/14
331-255
AURORA, IL
ONVOY, LLC
8/22/17
331-256
AURORA, IL
CELLCO PARTNERSHIP DBA VERIZON WIRELESS - IL
9/13/11
331-257
NAPERVILLE, IL
CELLCO PARTNERSHIP DBA VERIZON WIRELESS - IL
12/10/18
331-258
AURORA, IL
RCLEC, INC. - IL
2/14/19
331-259
SUGARGROVE, IL
CELLCO PARTNERSHIP DBA VERIZON WIRELESS - IL
2/18/19
331-260
DOWNERSGRV, IL
TELEPORT COMMUNICATIONS AMERICA, LLC - IL
2/25/19
331-261
LEMONT, IL
T-MOBILE USA, INC.
6/20/19
331-262
AURORA, IL
SPRINT SPECTRUM L.P.
7/30/08
331-263
ITASCA, IL
ONVOY, LLC - IL
3/11/16
331-276
ST CHARLES, IL
CELLCO PARTNERSHIP DBA VERIZON WIRELESS - IL
11/10/14
331-281
NAPERVILLE, IL
AMERITECH ILLINOIS
10/25/12
331-300
AURORA, IL
T-MOBILE USA, INC.
3/17/16
331-301
AURORA, IL
LOCAL ACCESS LLC - IL
3/13/13
331-302
AURORA, IL
CELLCO PARTNERSHIP DBA VERIZON WIRELESS - IL
2/11/13
331-303
ELBURN, IL
CIBOLO CREEK VENTURES, LLC DBA ROUTEPOINT COMM IL
4/22/13
331-304
BARTLETT, IL
T-MOBILE USA, INC.
2/20/15
331-305
NAPERVILLE, IL
CELLCO PARTNERSHIP DBA VERIZON WIRELESS - IL
8/15/13
331-307
LOMBARD, IL
T-MOBILE USA, INC.
10/13/14
331-308
BARTLETT, IL
BANDWIDTH.COM CLEC, LLC - IL
12/23/14
331-309
[UNASSIGNED]
331-310
BIG ROCK, IL
BANDWIDTH.COM CLEC, LLC - IL
12/29/14
331-311
[UNASSIGNED]
331-312
[UNASSIGNED]
331-315
LOMBARD, IL
NEW CINGULAR WIRELESS PCS, LLC - IL
8/8/16
331-318
LEMONT, IL
LOCAL ACCESS LLC - IL
8/1/13
331-321
AURORA, IL
T-MOBILE USA, INC.
7/20/15
331-330
NAPERVILLE, IL
NEW CINGULAR WIRELESS PCS, LLC - IL
8/19/08
331-331
[UNASSIGNED]
331-332
NAPERVILLE, IL
NEW CINGULAR WIRELESS PCS, LLC - IL
11/3/08
331-333
NAPERVILLE, IL
NEW CINGULAR WIRELESS PCS, LLC - IL
11/3/08
331-385
AURORA, IL
NEW CINGULAR WIRELESS PCS, LLC - IL
9/28/16
331-401
NAPERVILLE, IL
LEVEL 3 COMMUNICATIONS, LLC - IL
12/14/15
331-411
[UNASSIGNED]
331-422
ST CHARLES, IL
LEVEL 3 COMMUNICATIONS, LLC - IL
11/13/08
331-425
AURORA, IL
T-MOBILE USA, INC.
7/11/07
331-431
AURORA, IL
BANDWIDTH.COM CLEC, LLC - IL
5/26/10
331-442
ST CHARLES, IL
CELLCO PARTNERSHIP DBA VERIZON WIRELESS - IL
10/30/08
331-444
NAPERVILLE, IL
CELLCO PARTNERSHIP DBA VERIZON WIRELESS - IL
8/4/10
331-452
AURORA, IL
CELLCO PARTNERSHIP DBA VERIZON WIRELESS - IL
9/20/07
331-454
AURORA, IL
NEW CINGULAR WIRELESS PCS, LLC - IL
5/7/09
331-456
ROSELLE, IL
FIRST COMMUNICATIONS LLC - IL
12/5/07
331-457
NAPERVILLE, IL
CELLCO PARTNERSHIP DBA VERIZON WIRELESS - IL
11/14/08
331-462
LOMBARD, IL
XO ILLINOIS, INC.
8/23/08
331-465
W CHICAGO, IL
NEW CINGULAR WIRELESS PCS, LLC - IL
10/17/07
331-472
NAPERVILLE, IL
T-MOBILE USA, INC.
10/22/08
331-481
DOWNERSGRV, IL
CELLCO PARTNERSHIP DBA VERIZON WIRELESS - IL
10/29/08
331-511
[UNASSIGNED]
331-551
LOMBARD, IL
NEW CINGULAR WIRELESS PCS, LLC - IL
11/5/08
331-555
[UNASSIGNED]
331-575
AURORA, IL
SPRINT SPECTRUM L.P.
9/18/07
331-588
ST CHARLES, IL
NEW CINGULAR WIRELESS PCS, LLC - IL
2/15/10
331-591
[UNASSIGNED]
331-611
[UNASSIGNED]
331-618
[UNASSIGNED]
331-625
DOWNERSGRV, IL
CELLCO PARTNERSHIP DBA VERIZON WIRELESS - IL
10/16/09
331-630
[UNASSIGNED]
331-642
ELMHURST, IL
BANDWIDTH.COM CLEC, LLC - IL
331-643
AURORA, IL
SPRINT SPECTRUM L.P.
9/18/07
331-645
ELMHURST, IL
SPRINT SPECTRUM L.P.
11/5/07
331-666
AURORA, IL
ONVOY, LLC
9/29/17
331-684
AURORA, IL
SIGECOM, LLC DBA WOW INTERNET CABLE AND PHONE
7/12/07
331-700
[UNASSIGNED]
331-701
NAPERVILLE, IL
CELLCO PARTNERSHIP DBA VERIZON WIRELESS - IL
12/11/14
331-702
NAPERVILLE, IL
MCI WORLDCOM COMMUNICATIONS, INC. - IL
10/23/13
331-703
W CHICAGO, IL
T-MOBILE USA, INC.
10/24/13
331-704
KANEVILLE, IL
BANDWIDTH.COM CLEC, LLC - IL
4/21/15
331-707
AURORA, IL
T-MOBILE USA, INC.
8/23/16
331-708
[UNASSIGNED]
331-711
[UNASSIGNED]
331-716
WHEATON, IL
ONVOY, LLC
1/18/16
331-717
OSWEGO, IL
NEW CINGULAR WIRELESS PCS, LLC - IL
1/18/16
331-725
OSWEGO, IL
NEW CINGULAR WIRELESS PCS, LLC - IL
331-757
LEMONT, IL
T-MOBILE USA, INC.
7/13/16
331-771
ST CHARLES, IL
ONVOY, LLC - IL
2/10/16
331-773
[UNASSIGNED]
331-775
DOWNERSGRV, IL
COMCAST PHONE OF ILLINOIS, LLC DBA COMCO - IL
1/4/16
331-777
DOWNERSGRV, IL
CELLCO PARTNERSHIP DBA VERIZON WIRELESS - IL
9/22/10
331-779
[UNASSIGNED]
331-800
W CHICAGO, IL
ONVOY, LLC
9/29/17
331-801
DOWNERSGRV, IL
TELEPORT COMMUNICATIONS AMERICA, LLC - IL
5/15/14
331-803
LEMONT, IL
PEERLESS NETWORK OF ILLINOIS, LLC - IL
4/10/13
331-806
WHEATON, IL
COMCAST PHONE OF ILLINOIS, LLC DBA COMCO - IL
6/11/15
331-808
PLANO, IL
BANDWIDTH.COM CLEC, LLC - IL
6/5/15
331-811
[UNASSIGNED]
331-814
NAPERVILLE, IL
T-MOBILE USA, INC.
6/25/15
331-815
[UNASSIGNED]
331-825
GENEVA, IL
DIGITAL NETWORK ACCESS COMMUNICATIONS, INC. - IL
331-826
ELMHURST, IL
SPRINT SPECTRUM L.P.
11/18/08
331-847
[UNASSIGNED]
331-871
W CHICAGO, IL
ONVOY, LLC - IL
2/17/16
331-872
[UNASSIGNED]
331-888
WARRENVL, IL
PEERLESS NETWORK OF ILLINOIS, LLC - IL
9/24/10
331-901
ST CHARLES, IL
BANDWIDTH.COM CLEC, LLC - IL
4/23/15
331-903
DOWNERSGRV, IL
AT&T CORP.
5/15/14
331-911
[UNASSIGNED]
331-950
[UNASSIGNED]
331-958
AMERITECH ILLINOIS
[UNASSIGNED]
331-959
AMERITECH ILLINOIS
[UNASSIGNED]
331-976
[UNASSIGNED]
331-979
ELMHURST, IL
COMCAST PHONE OF ILLINOIS, LLC DBA COMCO - IL
3/3/15
331-980
AURORA, IL
T-MOBILE USA, INC.
10/13/14
331-998
DOWNERSGRV, IL
CELLCO PARTNERSHIP DBA VERIZON WIRELESS - IL
9/16/15
331-999
OSWEGO, IL
BANDWIDTH.COM CLEC, LLC - IL
9/22/10
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